Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Optimum Friction Damper Design

The main goal in this task was to study friction damper behaviour on a simplified structure under rotation in a vacuum. The test assembly made up of 2 engine style rotor blades with a range of under platform dampers between them. This arrangement removed aerodynamic effects and allowed the friction effect on its own to be quantified. Excitation was applied directly to the blades via piezoelectric material on the blade platform, ensuring sliding of the dampers. Response was measured by means of strain gauges on the blades.

The experimental set up allowed the efficiency of the friction damper element to be determined for any blade vibration mode and hence its effect on blade amplitude can be predicted. It was also possible to introduce a phase difference between the adjacent blades, simulating engine order variation and to independently vary the damper normal force by changing rotation speed.

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